<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>padding与背景</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            background: gray;
            border: 10px solid blue;
        }
    </style>
</head>
<body>
    <div>
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    </div>
</body>
</html>